Mining drill and bit



- March 1;, 1938. w. cooK MINING DRILL AND BIT Filed Oct. 30, 1956 Patented Mar. l, 1938 l UNITED STATE MINING DRILL ANI) Brr waiter cook, Benton,

Mine Equipment Co.,

ration of Michigan Ill., assigner to Central St. Louis, Mo., acorpofv Application October 30,' 1936, Serial No. 108,349

9 Claims.

This invention relates to mining drills and bits, and has special reference to detachable drill heads and detachable bits therefor designed and adapted specially for use in connection with electric breast drills and hand breast drills andV Objects of the invention are to provide an irnproved detachable drill head having detachable bits in connection therewith that may be made and sold at low cost and that are suitable 'for either electric or hand breast drilling; to provide.

. bits of novel form and design with wedges for l5 securing them in connection with the drill head in such a manner that the bits deflect the cuttings inwardly and somewhat toward the center of the drill head and prevents the material from oilering so much Vresistance to the person operating the breast drill as do other types oi' breast drills with which I am familiar: to provide a drill with novel bits that relieve or reduce the pressure required to operate the drill and which apply a puDing-in force or tendency when the drill, is g5' operating; to provide novel detachable wedges for cooperating with the novel bits so as to secure the bits in connection with the head so that the bits will feed the material inwardly; to provide bits made of material that is polygonal in cross-section and are bent or curved diagonally or toward one oi the corners thereof, and which have oblique or inclined walls at their outer ends forming sharp cutting edges having extended points or corners at their inner sides from which the edges incline rearwardly and outwardly to rintersection with the outer edges of the bits; and to provide a novel drill head with detachable bits and wedges in connection therewith, assembled in a novel relationship and providing adrill that o is substantially free irom vibration when in use. Another object oi the invention Ais to provide a drill head having bits of novel construction attached thereto causing the cuttings from the ma-g terial or mineral to owtoward the center of the drill head so that they will move rapidly along 'the drill without substantial tendency to choke or retard operation oi the drill.

Other objects o! the invention will be apparent from the following descriptiomlreference being made to the annexed drawing, in which-7 Eg. l is a side elevation of a drill head equipped with my improved bits.

Fig. 2 is a side elevation at right angles to that shown in Fig. l. r 111g. 3 is an end elevation.

(ci. zas-ss) Fig. 4 is an end elevation of the drill head, the bits and the wedges being shown in section at the endwi the drill head.

Fig. 5 is a side elevation of a wedge and two bits in connection therewith assembled ready to 5 be driven into the socket in the drillhead.

Fig. 6 is a side edge elevation of the wedge and one ofthe bits in connection therewith.

Fig. 'I is a rear side elevation of one of the bit blanks before it is bent to iinal shape. 1 Fig. 8 is a side edge elevation looking toward the righthand side of the blank shown in Fig. 7.

Fig. 9 is a sectional view on the line 8 9 oi Fig. 5.

Fig. 10 is an end elevation of a drill head having th`e sockets therein formed at differentangles from the angles of the socket in Fig. 4, the bits and the wedges being shown in section adjacent to the end of the drill head.

Fig. l1 is a sectional view of one of the wedges and the two associated bits of the type shown in Fig. 10 but detached from the drill head.

'I'he invention herein disclosed, in one aspect, `is an advance and improvement in reference to the inventions disclosed in my prior application Serial No. 65,054, iiled February 21,1936; and the novel subject matter herein disclosed and claimed attains the new and useful objects, functions and effects sta-ted generally in the preceding part oi this specication and now morespeciilcally described. g

Thesdetachable drill head i shown in Figs. 1 to 4, inclusive, is designed and intended to be attached to the main part of an auger'in the manner of the drill head disclosed in my said copending application. In the specific construction vshown in Figs.' 1 to 4, inclusive, the end of the head I is provided with two sockets 2 which are inclined relative to the axis of the drill. I'hese sockets incline inwardly from their forward ends toward their rear ends which are open, and also incline forwardly in the direction in which the drill is rotated when in use. These sockets. are provided to receive the rear ends of the bits and also to receive wedges whereby the bits are rigidly and detachably attached to. the head I.

As shown in Fig. 4, the front and rear side walls of each ofthe sockets 2 are approximately parallel, the front walls being spaced a substantial distance apart and substantially' outwardly from the axis of the head, which is to say that the front .walls of the sockets 2 are angularly disposed to the radii of thehead. The outer ends of each of the sockets 2 comprise corners 3 formed by walls l converging from the front and rear walls 'of said sockets to intersection at and to form said corners l. Similarly, the inner ends of said sockets 2 comprise comers lformed by walls B converging from the ends of the side walls of the sockets to intersection at and to lform the corners 5.

The bits comprised within the present invention are oi novel construction, each being formed from an elongated blank I which, in the specic embodiment shown, is substantially square in cross-section and has on its outer end a beveled wall 8 formed on a bias, which iste say that its rear end 9 extends angularly acrossthe iront side of the blank 1 and its forward end intersects the rear side of the blank 'I diagonally to form an inclined cutting edgeA I0. 'After this blank has been formed, it is bent diagonally into arcuate form in whichv the corner I I is the outerv wall of the arc and the diagonally opposite cornerI2 is the inner wall of the arc. 'Ihese bits are proportioned and shaped so that, when they are placed in the sockets, onecorner of each bit williit within the corner 3 or within the corner of each socket, and two of the side walls of each bit will seat and wedge `against the two walls 4 or against the two walls 6 of each socket, as clearly shown in Fig. 4 of the drawing.

' `In this embodiment ofthe invention, the bits are'wedgedin the sockets by wedges appropriately shaped and formed for that purpose. Each wedge comprises an elongated tapered body I3 having a length greater than the length of any 'of the sockets 2 so that, when the wedges aredriven into the respective sockets, the rear ends of the wedges will extend beyond the rear ends of the sockets and constitute heads Il adapted to be struck by a hammer or other tool and driven forwardly from the sockets. This implies that the wedges taper rearwardly, as shown.

Each wedge is formed in two otits opposite sides witlf angular grooves I5 the walls of which y grooves constitute seats for the walls of the bits opposite from the walls of said bits which seat against the socket walls l and 6, respectively. To permit the wedges to turn properly to tight wedging position in the sockets, the rear walls I6 of said wedges are unded (Fig. 4) so that,

when they lseat against the rear walls of the sockets 2, the wedges may turn properly to form the wedgin'g engagement with the respective bits and with the walls of the sockets in which the y wedges and bits are clamped.

It will be observed that the beveled walls 4 in- I tersectthe rear walls of the bit bodies in such a way as to form the inclined cutting edges I0 having forwardly extended points orl corners Il beyond the remaining portions o /the cutting E,eglgesmsThis constructiorisiected by forming the beveled Walls 8' on a bias or'inclination, as shown, and bending or curving -the `bits vin a .l diagonal direction so that thecorners I2 are at sockets I8 in this manner, the. two bits toward the center-of the head are almost in radial alinement with their respective outer bits; whereas, 4

in the arrangement shown in Fig. 4, the bits nearer the periphery of the head are considerably in advance of the inner bits when the drill is rotating. The arrangement show n in Fig. 10 feeds the cuttings more rapidly toward the axis out departure from the nature ,of the drill head so that the cuttings will Apassy the spiral auger.

From the foregoing it should. be apparent that this invention attains its intended objects and purposes efficiently, and that such variations in the formation and relationship of the parts are contemplated as may be required to adapt the invention for use in drilling through dierent substances and minerals. Other variations may be made within the scope of the invention withand principle thereof.

l. Inaminingdrillbavingapairofsocketsin its forward end each having two side walls and two converging walls at each end forming corners at the inner and outer ends of said sockets, bits extending into said sockets and having comers seated in said corners in said sockets. and wedges having sockets complementary to said corners at the ends of said sockets wedging said bits in said sockets in a relationship inwhich comers of said bits extend forwardly in the` general direction of rotation of the drill, and said bits curving diagonally toward said forwardly extending corners thereof and having diagonally biased and forming a sharp cutting edge.

3.' A bitof the character described comprising an elongated body that is substantially rectangu- .lar in cross-section and which curves diagonally leaving one of said corners forming the outer edge of the curved'body and a diagonally opposite corner forming the inner cin'ved edge of said body, and said body having a'diagonally biased beveled wall at its forward end extending .to intersection with the side of the blt between the outer and vrear corners and forming a sharp cutting edge with a sharp point at its rear corner, leaving said cutting edge inclining outwardly.

4. A bit of the character ,described comprising a body that is polygonal in cross-section and which is curvedon a radius that is diagonal of said body, and said body having a beveled wall inclinlng from one side to the other and extending from the inner corner of the bit to the ldiagonally opposite corner on an inclined piane l and intersecting the wall between the outer'and rear corners. Y

, 5. A bit of the character described comprising a body that is polygonal in cross-section and which is curved on a radius that is diagonal of said body, and said body having a beveled wall inclin- 'ing from "one side to the other and extending 6. In a. mining drm, a head having two sockets with their walls intersecting radii of the body at relatively considerable angles and each having two side walls and two converging walls at each nsv end forming corners, polygonal bits extending into the ends of said sockets and having corners seated in the corners of said sockets and being bent and curved forwardly diagonally of the body polygonal in cross-section extending into said sockets and being curved forwardly diagonally of the bodies of said bits, and sharp cutting edges on theforward ends of said bits extending from 5 of said bits and having sharp cutting edges on their outer'corners to inwardly adjacent corners. 5 their outer ends, and wedges detachably holding 9. In a mining drill, a head having a pair of Said bits in said sockets. sockets in its forward end, a pair of. polygonal '1. In a mining drill, ahead having two sockets bits extending into each of said sockets and oi.' substantially equal width with their forward diverging forwardly and being curved forwardly 10 walls approximately radial in the body of the diagonally of the bodies thereof and having sharp 10 Patent No Z, 109 615-,

head and each having two converging walls at each end forming corners, polygonal bits mounted in said sockets and having corners seated in said rst named corners, and being curved forwardly diagonally of the bodies of said bits, and wedges clamping said bits in said sockets and extending rearwardly beyond the ends of said sockets.

8. In a mining drill, a head having a pair of sockets inthe forward end thereof, bits that are CERTIFICATE 0F CORRECTION.

cutting edges on their forward ends extending from their outer corners to inwardly adjacent corners, and wedges having sockets in their inner and outer sides extending into said respective sockets in said head and clamping-said bits in said -sockets in said head in forwardly diverging relationship.

WALTER COOK.

. March `i, 1958.

WALTER COOK.

Itis-hereby vc-,ertified that the State of' Incorporation of the assignee in the above numbered patentlwas erroneously given as "Michigan", whereas said State 'should havebeen given'as Missouri, as shown by the record of" assigiments in thisoffice; and that said Letters Patent should be read with this correction therein that the same mayconform to the record of the case 'in the Patent Office. v

signed and sealed this 12th vmy of Apr-11,' ALD. 1958.

Henry Van Arsdale Acting Conmiissioner of Patents.

end forming corners, polygonal bits extending into the ends of said sockets and having corners seated in the corners of said sockets and being bent and curved forwardly diagonally of the body polygonal in cross-section extending into said sockets and being curved forwardly diagonally of the bodies of said bits, and sharp cutting edges on theforward ends of said bits extending from 5 of said bits and having sharp cutting edges on their outer'corners to inwardly adjacent corners. 5 their outer ends, and wedges detachably holding 9. In a mining drill, a head having a pair of Said bits in said sockets. sockets in its forward end, a pair of. polygonal '1. In a mining drill, ahead having two sockets bits extending into each of said sockets and oi.' substantially equal width with their forward diverging forwardly and being curved forwardly 10 walls approximately radial in the body of the diagonally of the bodies thereof and having sharp 10 Patent No Z, 109 615-,

head and each having two converging walls at each end forming corners, polygonal bits mounted in said sockets and having corners seated in said rst named corners, and being curved forwardly diagonally of the bodies of said bits, and wedges clamping said bits in said sockets and extending rearwardly beyond the ends of said sockets.

8. In a mining drill, a head having a pair of sockets inthe forward end thereof, bits that are CERTIFICATE 0F CORRECTION.

cutting edges on their forward ends extending from their outer corners to inwardly adjacent corners, and wedges having sockets in their inner and outer sides extending into said respective sockets in said head and clamping-said bits in said -sockets in said head in forwardly diverging relationship.

WALTER COOK.

. March `i, 1958.

WALTER COOK.

Itis-hereby vc-,ertified that the State of' Incorporation of the assignee in the above numbered patentlwas erroneously given as "Michigan", whereas said State 'should havebeen given'as Missouri, as shown by the record of" assigiments in thisoffice; and that said Letters Patent should be read with this correction therein that the same mayconform to the record of the case 'in the Patent Office. v

signed and sealed this 12th vmy of Apr-11,' ALD. 1958.

Henry Van Arsdale Acting Conmiissioner of Patents. 

